comedi_nscans_left(9)

💅 comedi_nscans_left(9)

okay so bestie, this one is from the Kernel API Manual and it's literally about figuring out how many scans you have left in a COMEDI command. no cap. 🎀

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✨ NAME ✨

comedi_nscans_left — return the number of scans left in the command 🦋

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🌸 SYNOPSIS 🌸

unsigned int comedi_nscans_left (struct comedi_subdevice *s , unsigned
       int nscans );

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💖 ARGUMENTS 💖

• s — COMEDI subdevice. the main character we're checking on. 👑
• nscans — the expected number of scans, or 0 for all available scans. yes, 0 is the "gimme everything" vibe. ✨

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🧚 DESCRIPTION 🧚

so, if nscans is 0, it gets set to the number of scans available in the async buffer. periodt. 💅

and if the async command has a stop_src of TRIG_COUNT, then nscans gets checked against the number of scans remaining to complete the command. like a little vibe check for your scan count. 🔥

the return value is then either the expected number of scans or the number of scans remaining to complete the command — whichever is fewer. that's it, that's the whole girlie. 🫶

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🌈 SEE ALSO 🌈

kernel file ./drivers/comedi/drivers.c, plus these iconic functions:

• comedi_set_hw_dev(9)
• comedi_alloc_devpriv(9)
• comedi_alloc_subdevices(9)
• comedi_alloc_subdev_readback(9)
• comedi_readback_insn_read(9)
• comedi_timeout(9)
• comedi_dio_insn_config(9)
• comedi_dio_update_state(9)
• comedi_bytes_per_scan_cmd(9)
• comedi_bytes_per_scan(9)
• comedi_nsamples_left(9)
• comedi_inc_scan_progress(9)
• comedi_handle_events(9)
• comedi_load_firmware(9)
• __comedi_check_request_region(9)
• comedi_check_request_region(9)
• comedi_legacy_detach(9)
• comedi_auto_config(9)
• comedi_auto_unconfig(9)
• comedi_driver_register(9)
• comedi_driver_unregister(9)

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mwah 💋 this lil page is from the Kernel API Manual, sourced from ./drivers/comedi, dated October 2026 — comedi_nscans_left(9) out. 💜🌸